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NVMe Tiering with AMD Ryzen CPU workaround for VCF 9.0

06.19.2025 by William Lam // 2 Comments

If you have an AMD Ryzen processor and you are planning on use the NVMe Tiering feature with either VMware vSphere Foundation (VVF) or VMware Cloud Foundation (VCF) 9.0, you will need to apply the following workaround for your VMs to properly boot.

Note: This workaround is only required on AMD Ryzen (Consumer) CPU with NVMe Tiering enabled and does not affect AMD EPYC, Intel Xeon or Intel  Core (Consumer) CPUs with our without NVMe Tiering.

On an AMD Ryzen CPU that has NVMe Tiering enabled, when powering on a VM, you might notice the operating system does not fully boot and the VM console may become unresponsive. After spending some time debugging with Engineering, it looks like there are some issues with specific AMD Ryzen CPU instructions that is causing the VM to behave this way when NVMe Tiering is enabled.

[Read more...]

Categories // ESXi, vSphere 9.0 Tags // AMD, VCF 9.0, vSphere 9.0

ESXi on GMKtec EVO-X1 with AMD Ryzen AI Pro 300 Series (formally Strix Point)

03.05.2025 by William Lam // 4 Comments

My experiences with small form factor (SFF) systems and Mini PCs over the years have primarily involved Intel-based systems, as they have been the most capable and compatible with the VMware ESXi Hypervisor—especially when it comes to onboard networking options.

Intel's introduction of their Hybrid CPU core architecture starting with 12th Gen (Alder Lake) and continues with 13th Gen (Raptor Lake), 14th Gen (Meteor Lake), and now 15th Gen (Arrow Lake), presents a unique challenge for running ESXi.

When AMD announced their Ryzen AI 300 Series processors (formally codenamed Strix Point) based on their new Zen 5 architecture, I was pretty excited with their approach to a "Hybrid" processor:

AMD's approach to its 'compact' Zen 5c cores is inherently different than Intel's approach with its e-cores. Like Intel's E-cores, AMD's Zen 5c cores are designed to consume less space on a processor die...But the similarities end there. Unlike Intel, AMD employs the same microarchitecture and supports the same features with its smaller cores.

Since both the Zen 5 and Zen 5c cores contain the exact same CPU features, they would be considered uniform cores unlike the Intel platform, which now includes three different core types (Performance, Efficiency & Low-Power Efficiency), requiring additional workarounds to be able to utilize most of the cores available on the SoC.

While there is currently only a handful of Ryzen AI Pro 300 Series kits that are available for purchase, I was fortunate to get hands on with one from a company called GMKtec, who is a relatively new player in the small form factor market. I have personally never used a GMKtec system before, so I was looking forward to seeing what they had to offer.


Disclaimer: As of publishing this blog post, a fellow colleague has not had any luck in contacting GMKtec to initiate a return, they have been completely non-responsive for several weeks now. I have also observed simliar negative feedback on various Reddit threads, which is certainly concerning for potential prospects. Users may want to consider purchasing GMKtec systems using Amazon, rather than directly from the vendor in case you need an exchange or return.

[Read more...]

Categories // ESXi, Home Lab, VSAN, vSphere Tags // AMD, GMKtec, Strix Point

Quick Tip - Virtualized Intel VT-x/EPT or AMD-V/RVI is not supported on this platform for VMware Workstation

12.17.2024 by William Lam // 2 Comments

In both Microsoft Windows 10 and 11, Virtualization Based Security (VBS) is enabled by default and this capability uses Hyper-V under the hood, which is a form of Nested Virtualization. If you are using VMware Workstation and you attempt to power on a Nested ESXi VM, you probably will see one of the following error messages based on the CPU vendor:

  • Virtualized Intel VT-x/EPT is not supported on this platform 
  • Virtualized AMD-V/RVI is not supported on this platform 

While VMware Workstation has been enhanced to co-exists with Hyper-V through a new Host VBS Mode introduced in VMware Workstation 17.x:

Workstation Pro uses a set of newly introduced Windows 10 features (Windows Hypervisor Platform) that permits the use of VT/AMD-V features, which enables Workstation Pro and Hyper-V to coexist. And because VBS is built on Hyper-V, Windows hosts with VBS enabled can now power on VM in Workstation Pro successfully

This are few limitations as mentioned in the VMware Workstation documentation.

With that said, if you do need to run Nested ESXi under VMware Workstation, you just need to disable Windows VBS, assuming you have administrative privileges on your system.

[Read more...]

Categories // Workstation Tags // AMD, Intel, VBS, workstation

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William is Distinguished Platform Engineering Architect in the VMware Cloud Foundation (VCF) Division at Broadcom. His primary focus is helping customers and partners build, run and operate a modern Private Cloud using the VMware Cloud Foundation (VCF) platform.

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Recent

  • VCF 9.0 Single Sign-On (SSO) with Keycloak IdP 06/23/2025
  • Is my NIC supported with Enhanced Data Path (EDP) with VCF 9.0 06/23/2025
  • PowerCLI remediation script for running NSX Edge on AMD Ryzen for VCF 9.0 06/20/2025
  • Failed to locate kickstart on Nested ESXi VM CD-ROM in VCF 9.0 06/20/2025
  • NVMe Tiering with Nested Virtualization in VCF 9.0 06/20/2025

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